|
History Home Events Birthdays Deaths Years |
|
Add "Today in History" or "Today's Birthdays" to Your Site - it's Easy! |
|
|
|
History Home Events Birthdays Deaths Years |
|
Add "Today in History" or "Today's Birthdays" to Your Site - it's Easy! |
|
Amplification
|
|
|
1933 1st voice amplification system to be used in U.S. Senate
1906 U.S. inventor Lee de Forest patents "Audion," a 3-diode amplification valve which proved a pioneering development in radio and broadcasting |
|
|
|
|
| History Home Copyright 2009 BrainyMedia.com | |